Merapi volcano (Central Java, Indonesia) - Smithsonian / USGS Weekly Volcanic Activity Report for 20 January-26 January 2021 (New Activity / Unrest)
BPPTKG reported that the “2021 lava dome” continued to grow just below Merapi's SW rim during 15-21 January, producing a total of 282 incandescent lava avalanches that traveled as far as 1 km down the Krasak and Boyong river drainages on the SW flank. Pyroclastic flows were recorded 19 times and descended the SW flanks as far as 1.8 km. A comparison of photos taken on 14 and 21 January showed that the morphological changes in the summit area were attributed to the emergence of new lava domes.
Ср, 20 янв 2021, 06:0006:00 AM | ПЇЅПЇЅПЇЅПЇЅПЇЅ: VN
The 2021 dome volume was an estimated 104,000 cubic meters on 21 January, with a growth rate of about 8,600 cubic meters per day. Deformation continued, though at a lower rate; Electronic Distance Measurement (EDM) data showed a distance shortening between points in the NW at a rate of 0.8 cm per day. Seismic activity was lower than the previous week.
According to news articles ashfall was reported in several villages in the Musuk, Tamansari, and Kemalang districts on 19 January. The Alert Level remained at 3 (on a scale of 1-4), and the public were warned to stay 5 km away from the summit.
Sources: Balai Penyelidikan dan Pengembangan Teknologi Kebencanaan Geologi (BPPTKG), Detik News, Detik News
From: Global Volcanism Program, 2021. Report on Merapi. In: Mayberry, G (ed.), Weekly Volcanic Activity Report 20 January-26 January 2021. Smithsonian Institution and US Geological Survey.
Sat, 16 Jan 2021, 18:26
The activity of the volcano is on increasing trend. A first true pyroclastic flow descended this morning from the growing lava dome. ... Read all
Wed, 13 Jan 2021, 21:30
The active lava dome continues to grow slowly and produce incandescent rockfalls through the gap in the southwestern crater wall. Small avalanches from these events continue to travel down the upper Krasak drainage channel. ... Read all